usb测试标准

以下为USB测试标准，参考标准为USB Specification Revision 2.0
USB　Electrical,Mechanical,and Environmental Compliance Standards
Test Descriptio Performance Requirement
Visual and Dimensional Inspection Must meet or exceed the requirements specified by the most current version of Chapter 6 of the USB Specification.
Insulation Resistance
绝缘电阻 大于等于1，000Ω
Dielectric
 Withstanding Voltage
耐电压 The dielectric must withstand 500V AC for one minute at sea level.
500　V　AC，一分钟
Low Level Contact Resistance
低电平接触电阻 30 mΩ maximum when measured at 20mV maximum open circuit at 100mA.Mated test contacts must be in a connector housing.
在开路最大电流为100 mA电压为20mV情况下最大为30mΩ
Contact Current Rating
温升 1.5A at 250V AC minimum when measured at an ambient temperature of 25℃.with power applied to the contacts ,the △T must not exceed +30℃at any point in the USB connector under test.
相对温度为25℃，250VAC，最小为1.5A。接通电压，测试中端子任一点的温度不超过＋30℃。
Contact Capacitance
接触电容 2 pF maximum unmated per contact.
最大为2pF
Insertion Force
插入力 35 N  maximum at a maximum rate of
12.5㎜ per minute
在插入速度不超过每分钟12.5㎜时不超过35N
Extraction Force
拨出力 10 N minimum at a maximum rate of 12.5㎜
per minute
在拔出速度不超过每分钟12.5㎜时不超过10N

Durability
耐用性 1,500 insertion/extraction cycles at a maximum rate of 200 cycles per hour.
在速度不超过每小时200个循环下经受1，500次插入与拨出。
Cable Pull-Out
电缆拉出 After the application of a steady state axial load of 40 N for one minute
固定后施加40N的轴向力,一分钟。
Test Descriptio Performance Requirement

Physical Shock

物理冲击 No discontinuities of 1μs,or longer duration when mated USB connectors are subjected to 11ms duration 30 Gs half-sine shock pulses.Three shocks in each direction applied along three mutually perpendicular planes for a total of 18 shocks.
匹配USB端子，中断不得大于或等于1μs,30Gs的半波脉冲承受11ms.从三个正交的方向施加冲击，总冲击数为18次

Random vibration
任意振动 No discontinuities of 1μs,or longer duration when mated USB connectors are subjected to  5.35Gs　RMS.15minutes in each of three mutually perpendicular planes
匹配USB端子，中断不得大于或等于1μs,承受5.35Gs　RMS.朝各个正交的方向各振动15分钟。
Thermal Shock
热冲击 10 cycles -55℃ and ＋85℃.The USB connectors under test must be mated.
在-55℃至＋85℃中循环10次，端子必须紧密配合。
Cable impedance
阻抗
 Impedance must be in the range specifiedin
Z0=90±15%;
ZCM=30±30%
Signal Pair Attenuation
衰减 Refer to Section 7.1.17
Frequency      att(max)
0.064          0.08
0.256          0.11
0.512          0.13
0.772          0.15
1    0.2
4    0.39
8    0.54
12    0.67
24    0.95
48    1.35
96 1.9
200    3.2
400 5.8
Test Descriptio Performance Requirement

Propagation Delay
传输延迟 
See Section 7.1.1.1,Section 7.1.4,Section 7.1.16, and Table 7-9
5.2ns/m MAX
Propagation Delay Skew
延迟偏移 Propagation skew must met the requirements as listed in Section 7.1.3 
最大不超过100ps/cable
Solderability
可焊性 USB contact solder tails must pass 95% coverage after one hour steam aging as specified in Category 2
在经过一个小时的蒸气老化后焊接端的覆盖率大于95%。
Humidity

抗潮性 168 hours minimum.The USB connectors under test must be tested in accordance with EIA 364-31.
大于168个小时。如EIA　364-31测试
Flammability  The manufacturer will require its thermoplastic resin vendor to supply a detailed C of C with each resin shipment.The C of C shal clearly show the resin’s Ul listing number,lot number,date code,etc.
94V-0